<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Log
 * @subpackage Writer
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Syslog.php 16971 2009-07-22 18:05:45Z mikaelkael $
 */

/** Zend_Log_Writer_Abstract */
require_once 'Zend/Log/Writer/Abstract.php';

/**
 * Writes log messages to syslog
 *
 * @category   Zend
 * @package    Zend_Log
 * @subpackage Writer
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Log_Writer_Syslog extends Zend_Log_Writer_Abstract
{
	/**
	 * Maps Zend_Log priorities to PHP's syslog priorities
	 * @var array
	 */
	protected $_priorities = array(
	Zend_Log::EMERG  => LOG_EMERG,
	Zend_Log::ALERT  => LOG_ALERT,
	Zend_Log::CRIT   => LOG_CRIT,
	Zend_Log::ERR    => LOG_ERR,
	Zend_Log::WARN   => LOG_WARNING,
	Zend_Log::NOTICE => LOG_NOTICE,
	Zend_Log::INFO   => LOG_INFO,
	Zend_Log::DEBUG  => LOG_DEBUG,
	);

	/**
	 * The default log priority - for unmapped custom priorities
	 * @var string
	 */
	protected $_defaultPriority = LOG_NOTICE;

	/**
	 * Last application name set by a syslog-writer instance
	 * @var string
	 */
	protected static $_lastApplication;

	/**
	 * Last facility name set by a syslog-writer instance
	 * @var string
	 */
	protected static $_lastFacility;

	/**
	 * Application name used by this syslog-writer instance
	 * @var string
	 */
	protected $_application = 'Zend_Log';

	/**
	 * Facility used by this syslog-writer instance
	 * @var string
	 */
	protected $_facility = LOG_USER;

	/**
	 * Class constructor
	 *
	 * @param  array $options Array of options; may include "application" and "facility" keys
	 * @return void
	 */
	public function __construct(array $params = array())
	{
		if (isset($params['application'])) {
			$this->_application = $params['application'];
		}
		if (isset($params['facility'])) {
			$this->_facility = $params['facility'];
		}
		$this->_initializeSyslog();
	}

	/**
	 * Initialize syslog / set application name and facility
	 *
	 * @param  string $application Application name
	 * @param  string $facility Syslog facility
	 * @return void
	 */
	protected function _initializeSyslog()
	{
		self::$_lastApplication = $this->_application;
		self::$_lastFacility    = $this->_facility;
		openlog($this->_application, LOG_PID, $this->_facility);
	}

	/**
	 * Set syslog facility
	 *
	 * @param  string $facility Syslog facility
	 * @return void
	 */
	public function setFacility($facility)
	{
		if ($this->_facility === $facility) {
			return;
		}
		$this->_facility = $facility;
		$this->_initializeSyslog();
	}

	/**
	 * Set application name
	 *
	 * @param  string $application Application name
	 * @return void
	 */
	public function setApplicationName($application)
	{
		if ($this->_application === $application) {
			return;
		}
		$this->_application = $application;
		$this->_initializeSyslog();
	}

	/**
	 * Close syslog.
	 *
	 * @return void
	 */
	public function shutdown()
	{
		closelog();
	}

	/**
	 * Write a message to syslog.
	 *
	 * @param  array $event  event data
	 * @return void
	 */
	protected function _write($event)
	{
		if (array_key_exists($event['priority'], $this->_priorities)) {
			$priority = $this->_priorities[$event['priority']];
		} else {
			$priority = $this->_defaultPriority;
		}

		if ($this->_application !== self::$_lastApplication
		|| $this->_facility !== self::$_lastFacility)
		{
			$this->_initializeSyslog();
		}

		syslog($priority, $event['message']);
	}
}
